a written permission, he had to write another letter to the president of the university.

     a written permission, he had to write another letter to the president of the university.

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Not giving

Not having been given

Having not given

Having not been given

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You’d better have your shoes        .

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mending

to mend

mend

mended

.I can hardly imagine so pretty girl like you ________ boxing.

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to like

liking

to have liked

_______to sunlight for too much time will do harm to one’s skin.

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Being exposed

Having exposed

Exposed

After being exposed

 ______ herself with other girls, she feels she is quite lucky.

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Comparing

Compared

To compare

Being compared

We’re conducting a nationwide survey of people’s reading habits. Would you have five minutes ________ a few questions?

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answering

to answer

to have answered

having answered

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